我的方法好笨啊..........

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#1 Created at ... [Delete] [Delete and Lock User]

var list = document.getElementById('test-list');

var web = ['HTML', 'CSS', 'JavaScript'];

for (let i = 0; i < list.children.length; i++) {

if ( web.indexOf(list.children[i].innerText) == -1) {

list.removeChild(list.children[i]);

i--;

}

#2 Created at ... [Delete] [Delete and Lock User]

再来一种：

var list = document.getElementById('test-list');

var web = ['HTML', 'CSS', 'JavaScript'];

var arr = Array.from(list.children);

arr.filter(x=>!web.includes(x.innerText)).map(x=>list.removeChild(x));